A General Framework for Modelling Association Formulated in Terms of Bond Sites

The general association model [1] has been adapted to describe association between bond sites rather than whole molecules. The resulting formulation permits a large range of different association schemes to be incorporated into a single framework. The model allows association strengths to vary for different sizes of oligomer, but it reduces to a number of special cases, in particular the theory of Wertheim. The formulation is compatible with most equations of state.